A beauty therapist in Perth has been sentenced to four years and eight months jail for sexually assaulting six women during hair removal treatments.

Don Subasinghe, 43, molested the women at the Canning Vale beauty salon he ran with his wife, between November 2010 and January 2011.

He sexually assaulted the women while he was performing intense pulse light treatments on their genital areas.

Subasinghe had been charged with 14 offences but was last year found guilty on seven of them, against six women.

The judge had rejected a request from the defence for sentencing to be delayed so that Subasinghe could get medical treatment.

While he was awaiting sentence in the dock, Subasinghe vomited several times.

District Court Judge Stephen Scott told Subasinghe he was "satisfied you abused the trust of the victims for your own sexual gratification".

The judge said the women had assumed the touching was necessary and appropriate, and "there was a degree of deception on your part".

The judge said Subasinghe, who had maintained his innocence, had shown no remorse for the victims and the sentence needed to reflect general and personal deterrence.

"Each victim trusted you," he said.

"The victims were vulnerable.

"Each victim was violated by you."

Defence lawyer Tom Percy told the court that "other than this one fortnight in his life, it's hard to fault anything he's done".

"He'd never do anything like this ever again," he said.

During the 11 day trial, prosecutor Gary Huggins told the court the women paid $250 for Brazilian treatments which some of them thought was a bargain, however, they did not know the beauty therapist was male.

Mr Huggins said while some of them felt uncomfortable, others did not mind, and they all decided to proceed with the treatment.

The court was told most of the women only lodged complaints after being contacted by police investigating the matter.

Subasinghe's lawyer Tom Percy told the jury his client had "... express and implied consent to do what was necessary to complete IPL treatment".

The defence lawyer said some of the women came back for more appointments and "... some even stayed on to have their hair done by his wife".

"None of these women ever asked him to stop treating them," he said.

Mr Percy also said only one of the women complained to police, and most of the other allegations were made only after the women were contacted by the investigating officers.